Screen plate, screen printing device and battery string sizing equipment

Abstract

The utility model discloses a sizing screen plate, a screen printing device and battery string sizing equipment, and belongs to the technical field of photovoltaic battery string production equipment. The sizing screen printing plate comprises a screen printing plate body, the bottom face of the screen printing plate body is provided with a protruding part protruding downwards, and the area where the protruding part is located is matched with the size of a current battery piece to be printed with glue. The mesh holes penetrate through the mesh plate body and the protruding part, the mesh holes are used for allowing glue liquid to pass through so as to form glue points on the current battery piece to be subjected to glue printing, and the height of the glue points is smaller than that of the protruding part. According to the glue applying screen printing plate, the protruding part only covers the current battery piece to be subjected to glue printing during glue applying, glue liquid forms glue points on the covered battery piece through the meshes, the height of the protruding part is larger than that of the glue points, it can be guaranteed that the glue applying screen printing plate does not rub the glue points on the adjacent battery piece subjected to glue printing, and therefore the glue applying quality in the glue applying operation process is guaranteed.

Description

Technical Field

[0001] The implementation mode of the utility model relates to the technical field of photovoltaic cell string production equipment. Specifically, the application relates to a screen plate, a screen printing device and a cell string glue application device. Background Art

[0002] After the busbarless battery cells are serially welded, it is usually necessary to apply glue to the battery string using a screen printing device to improve the connection strength between the busbarless battery cells and the welding ribbon.

[0003] The sizing screen of the screen printing device is provided with mesh holes, and the bottom surface of the sizing screen is usually flat. When the screen printing device is used to print glue on the surface of the battery string, the conveying device conveys the battery string to the bottom of the sizing screen, aligns a battery cell with the mesh holes of the sizing screen, and the scraper scrapes the sizing screen, and the glue is printed on the battery cell through the mesh holes. After a battery cell is printed with glue, the conveying device steps forward and conveys the next battery cell to the bottom of the sizing screen for printing glue. In order to ensure the tension of the sizing screen during printing glue, the deformation area of ​​the sizing screen is usually larger than the mesh area. For the battery string formed after the battery cells are welded in series, the cell spacing between the cells is very small, and the previous battery cell that has just been printed with glue is close to the mesh area. When the scraper scrapes the sizing screen, the deformation area of ​​the sizing screen is larger than the mesh area, which will cause the concave sizing screen to rub against the glue point on the battery cell that has just been printed with glue, which seriously affects the quality of the glue printing of the battery string. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a screen plate, a screen printing device and a battery string glue application device to ensure that when printing glue on the battery string, the glue points on the battery cells that have been printed with glue will not be rubbed by the glue application screen plate.

[0005] The solution of this application example is implemented through the following contents.

[0006] In a first aspect, an example of the present application provides a mesh plate, characterized in that the mesh plate comprises: a mesh plate body;

[0007] The bottom surface of the screen body is provided with a protruding portion protruding downward, and the area where the protruding portion is located matches the size of the battery cell currently to be printed with glue; and a plurality of mesh holes running through the screen body and the protruding portion, the mesh holes are used for allowing glue to pass through to form glue spots on the battery cell currently to be printed with glue, and the height of the glue spots is less than the height of the protruding portion.

[0008] The stencil provided in the present application includes a stencil body and a raised portion formed on the bottom surface of the stencil body, the raised portion being used to cover only the battery cell currently to be printed with glue when applying glue, the raised portion being formed with penetrating mesh holes, the mesh holes being used for the glue to pass through so as to form glue dots on the covered battery cell, the scheme provided in the present application also defines that the height of the raised portion is greater than the height of the glue dots, such height difference ensures that when printing glue on the battery cell currently to be printed with glue in the battery string, the glue dots on the battery cell in the battery string that has been printed with glue adjacent to the battery cell currently to be printed with glue will not be rubbed by the stencil, thereby ensuring the glue printing quality of the battery cell during the gluing operation.

[0009] According to some examples of the first aspect of the present application, the raised portion includes strip-shaped convex ribs arranged at intervals, and a plurality of mesh holes are formed on each of the strip-shaped convex ribs.

[0010] The strip convex ribs have the shape characteristics of continuous extension in one dimension, high structural strength, and easy processing and manufacturing. In addition, the strip convex ribs arranged at intervals can make the mesh plate have moderate tension, thereby reducing the amplitude of the concave deformation of the mesh plate when it is subjected to force.

[0011] According to some examples of the first aspect of the present application, the strip-shaped convex ribs are arranged at intervals along the first direction, and each strip-shaped convex rib extends along the second direction, and the second direction is perpendicular to the first direction.

[0012] When printing glue, a scraper on the screen moves in a certain direction. The strip convex ribs using this structural form can choose a direction parallel to the moving direction of the scraper when printing glue as the second direction to reduce the concave deformation of the screen caused by the scraper.

[0013] According to some examples of the first aspect of the present application, each strip-shaped convex rib is provided with at least one row of mesh holes.

[0014] The number of rows of mesh holes can be flexibly set according to the width of the strip convex ribs. For example, multiple rows of mesh holes can be set on a wider strip convex rib.

[0015] According to some examples of the first aspect of the present application, the raised portion is a planar plate-like structure, and all mesh holes are opened on the raised portion.

[0016] The raised portion of the planar plate-like structure has a simpler structure and is also convenient to process and manufacture.

[0017] According to some examples of the first aspect of the present application, the mesh plate includes a group of mesh holes, and the group of mesh holes is used to allow glue to pass through to form glue points on a battery cell in the battery string.

[0018] By setting only one group of mesh holes on the screen, it is possible to print only one battery cell at a time when printing the glue.

[0019] According to some examples of the first aspect of the present application, the mesh plate includes two groups of mesh holes, and the two groups of mesh holes are arranged at intervals, so as to allow the glue to pass through so as to simultaneously form glue spots on two adjacent battery cells in the battery string.

[0020] The two groups of mesh holes facilitate the simultaneous printing of glue on the two battery cells in the battery string. One glue application operation can achieve the purpose of forming glue dots on the two battery cells at the same time. This structure improves the efficiency of the glue application operation.

[0021] According to some examples of the first aspect of the present application, there is one protrusion, and the two groups of meshes are both arranged on the protrusion; or, there are two protrusions and they are arranged at intervals, and the two groups of meshes are respectively arranged on the two protrusions.

[0022] The structure of two groups of mesh holes on one raised part has a large area covered by the raised part, good structural integrity, and can ensure high structural strength. When two raised parts are arranged at intervals, the requirement of printing two sheets of glue at the same time can also be met.

[0023] According to some examples of the first aspect of the present application, the protrusion and the mesh plate body are integrally formed.

[0024] The integrally formed raised portion and the mesh plate body have the characteristics of better integrity and higher strength of the overall structure.

[0025] According to some examples of the first aspect of the present application, the height of the protrusion is 0.1 mm-0.5 mm.

[0026] The height of the rib can be flexibly selected according to the height of the glue dots printed on the battery cell. Generally, the height of the rib can be selected as long as the height of the rib is greater than the height of the glue dots.

[0027] According to some examples of the first aspect of the present application, the mesh plate is a steel plate.

[0028] The strength of steel plates is relatively high, and the mesh made of steel plates will have less concave deformation after being subjected to force. During the gluing process, it helps to prevent the glue spots on the battery cells that have been glued from being rubbed by the mesh.

[0029] In a second aspect, an example of the present application provides a screen printing device, which includes a screen plate and a scraper assembly as described above.

[0030] The screen printing device prints glue on the battery cell through the cooperation of the scraper assembly and the aforementioned screen. After the battery cell is aligned with the mesh of the screen, the scraper scrapes the screen to print the glue on the battery cell through the mesh. In the screen printing device of the present application, since the mesh is set on the raised part, the raised part only covers the battery cell to be printed with glue, and the height of the raised part is greater than the height of the glue point, so even if the screen is concave and deformed, the screen will not rub against the battery cell that has been printed with glue.

[0031] In the third aspect, the example of the present application provides a battery string gluing device, which includes a battery string conveying device and a silk screen printing device as described above, wherein: the silk screen printing device is arranged on the conveying path of the battery string conveying device, and the screen of the silk screen printing device is located above the battery string conveying device; the battery string conveying device is configured to convey the battery string in a step-by-step manner, so that the battery cells to be printed with glue in the battery string are sequentially conveyed to the bottom of the raised portion of the screen, and the scraper assembly is used to print the glue on the screen through the mesh holes onto the battery cell to be printed with glue currently.

[0032] The cooperation between the battery string conveying device and the screen printing device improves the continuity of the glue application operation and realizes the continuous glue printing of the battery cells in the battery string. The equipment can flexibly set the stepping rhythm to adapt to the production rhythm of the previous process, such as the rhythm of the previous battery cell and the welding ribbon, to avoid waiting for glue application and improve work efficiency.

[0033] According to some examples of the third aspect of the present application, the battery string gluing equipment also includes a curing device located downstream of the screen printing device, and the battery string conveying device is also configured to convey the battery string to the curing device, and the curing device is used to cure the glue spots on the battery cells after the glue is printed in the battery string, so that the solder strips in the battery string are bonded to the battery cells through the glue spots.

[0034] Since the glue is printed on the soldering tape welded to the battery cell, after printing the glue on the battery cell, the glue is immediately cured by a curing device, and the soldering tape is further bonded to the battery cell through the glue. This helps to increase the bonding strength between the soldering tape and the battery cell, thereby effectively avoiding separation between the soldering tape and the battery cell, and further facilitating the subsequent handling, layout and other operations of the battery string.

[0035] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A top view of the screen in the first embodiment in an application scenario;

[0037] Figure 2 It is a side view of the screen plate in the first embodiment in the application scenario;

[0038] Figure 3 For along Figure 1 Sectional view along line AA (partially enlarged view);

[0039] Figure 4 for Figure 2 A magnified view of part B;

[0040] Figure 5 is a schematic diagram of a first structure of the protrusion;

[0041] Figure 6 is a schematic diagram of a second structure of the protrusion;

[0042] Figure 7 A top view of the screen in the application scenario in the second embodiment;

[0043] Figure 8 is a side view of the screen in the application scenario in the second embodiment;

[0044] Fig. 9 A schematic diagram of two groups of meshes arranged on a raised portion;

[0045] Fig.10 It is a schematic diagram of two groups of meshes arranged on two raised parts.

[0046] In the figure:

[0047] 100. Screen body;

[0048] 200, raised portion; 210, strip-shaped convex rib; 220, planar plate-like structure; 201, first raised portion; 202, second raised portion;

[0049] 300, mesh; 310, first group of meshes; 320, second group of meshes;

[0050] 400, battery cell; 410, battery cell currently to be printed with glue; 411, first battery cell; 412, second battery cell; 420, battery cell that has been printed with glue. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0052] In a battery string formed by serial welding of main-grid-free battery cells, the welding strip is directly connected to the secondary grid line of the battery cell. In order to ensure the stability of the connection, it is often necessary to use a screen printing device to apply glue to the battery string, that is, to print glue dots on the welding strip of the battery cell, so as to use the glue dots to stick the welding strip and the battery cell together, so as to improve the connection strength between the welding strip and the battery cell. At present, the stencil used for applying glue to the battery string is a whole flat plate structure, the mesh penetrates the upper surface and the bottom surface of the stencil, and its bottom surface is generally flat. When printing glue on the battery cells in the battery string, the bottom surface contacts the battery cells, and a scraper is used to move on the upper surface of the stencil so that the glue on the upper surface passes through the mesh and forms glue dots on the battery cells. At this time, the previous battery cell in the battery string that has just been printed with glue is close to the mesh area. When the scraper scrapes across the stencil, because the deformation area of ​​the stencil is larger than the mesh area, the concave stencil will rub against the glue dots on the battery cell that has just been printed with glue, which seriously affects the quality of glue printing of the battery string.

[0053] In view of this, the embodiment of the present application provides a mesh plate, combined with Figures 1 to 4 As shown, the stencil includes: a stencil body 100 and a raised portion 200. The raised portion 200 is arranged on the bottom surface of the stencil body 100 and protrudes downward. The raised portion 200 has a certain height relative to the bottom surface of the stencil body 100, and the area where the raised portion 200 is located matches the size of the battery cell 410 to be printed with glue at present, ensuring that when printing glue, the area can only cover the battery cell 410 to be printed with glue at present, thereby ensuring that the raised portion 200 will not interfere with other battery cells 400. In addition, the stencil also includes a plurality of mesh holes 300 that penetrate the stencil body 100 and the raised portion 200. The mesh holes 300 are used for the glue liquid to pass through. The glue liquid passing through the mesh holes 300 forms glue spots (not shown in the figure) on the battery cell 410 to be printed with glue at present, and the height of the glue spots is less than the height of the raised portion 200. According to the foregoing description, the purpose of printing glue on each battery cell 400 in the battery string is to firmly connect the soldering tape and the battery cell 400 with the help of the formed glue dots. Therefore, when printing glue on the battery cell 400, the mesh 300 is generally aligned with the soldering tape on the battery cell 410 currently to be printed with glue, so as to ensure that the glue passes through the mesh to form glue dots on the soldering tape of the battery cell.

[0054] It should be explained that the area where the protrusion 200 described in this embodiment is located can only cover the battery cell 410 currently to be printed with glue, and "covering" means that when printing glue, the orthographic projection of the protrusion 200 can cover the battery cell 410 currently to be printed with glue.

[0055] The screen of the present application has a raised portion 200 with a height greater than the height of the glue dots on the bottom surface of the screen body 100, and the raised portion 200 only covers the battery cell 410 to be printed with glue during the glue application operation. Therefore, when the battery cell 410 to be printed with glue is printed with glue through the mesh 300 that passes through the screen body 100 and the raised portion 200, there is always a certain gap between the battery cell 420 that has been printed with glue and the bottom surface of the screen body 100. This gap can ensure that the glue dots on the battery cell 420 that has been printed with glue in the battery string will not be rubbed by the screen, thereby ensuring the glue printing quality of each battery cell 400 during the glue application process.

[0056] Figure 5 and Figure 6 The raised portion 200 located on the bottom surface of the mesh plate body 100 is schematically shown. Some structural forms of the raised portion 200 during specific implementation will be described below in conjunction with the accompanying drawings.

[0057] See also Figure 5 As shown, in this embodiment, the raised portion 200 includes strip-shaped convex ribs 210 arranged at intervals, and each of the strip-shaped convex ribs 210 is formed with a plurality of mesh holes 300. The strip-shaped convex ribs 210 have a shape characteristic of continuously extending in one dimension, have high structural strength, and are easy to process and manufacture. In addition, the strip-shaped convex ribs 210 arranged at intervals can also make the mesh plate have moderate tension, thereby helping to reduce the amplitude of the concave deformation when the mesh plate is subjected to force.

[0058] Optionally, the strip convex ribs 210 can be arranged at intervals along the first direction, and the interval between two adjacent strip convex ribs 210 can be determined according to the position of the glue point on the battery cell. Each strip convex rib 210 itself can extend along the second direction, so as to have a certain length in the second direction, and the second direction is perpendicular to the aforementioned first direction. According to the above description, the glue needs to pass through the mesh 300 to form glue points on the soldering strips of the battery cell 400. The battery cell 400 generally has a plurality of soldering strips arranged at intervals. Therefore, in specific implementation, the first direction can be parallel to the direction in which the soldering strips are arranged at intervals. At this time, the second direction (the length extension direction of the strip convex ribs 210) is consistent with the length extension direction of the soldering strips to ensure that the glue can be printed on the soldering strips through the mesh 300 on the strip convex ribs 210.

[0059] In addition, when printing glue, a scraper on the screen moves along a certain direction. For the spaced strip convex ribs 210, a second direction parallel to the scraper moving direction during printing glue can be selected to reduce the concave deformation of the screen caused by the scraper.

[0060] In an implementation example, the mesh holes 300 on each strip convex rib 210 are arranged in rows, and each strip convex rib 210 is provided with at least one row of mesh holes 300, and the number of mesh holes in each row and the number of rows of mesh holes are set accordingly according to the glue dot printing pattern.

[0061] See also Figure 6 As shown, in this embodiment, the protrusion 200 protruding downward from the bottom surface of the screen body 100 can also be a planar plate-like structure 220, and all meshes 300 are opened on the planar plate-like structure 220. When the protrusion 200 adopts the planar plate-like structure 220, the structure is simple and convenient for processing and manufacturing. The meshes 300 can also be arranged in rows, that is, multiple rows of meshes 300 are arranged at intervals on the planar plate-like structure 220. Similarly, the number of meshes in each row and the number of rows of meshes are set accordingly according to the glue dot printing pattern.

[0062] The above description has provided a detailed and sufficient discussion of the raised portion 200 in the present application. Therefore, those skilled in the art can implement the raised portion 200 of the present application example based on these contents, and print glue on the battery cell with the help of the mesh 300 that passes through the raised portion 200 and the screen body 100. Moreover, when printing glue on the current battery cell 410 to be printed with glue, the screen will not rub against the battery cell 420 that has been printed with glue, especially the glue spot on the battery cell, thereby avoiding damage to the glue spot.

[0063] The above mainly discusses the structural form of the protrusion 200, and the following turns to the description of the arrangement form of the mesh 300.

[0064] See also Figure 1 and Figure 2 As shown, and see Figure 5 and Figure 6 In some embodiments, all meshes 300 on the stencil form a group, and the glue passes through this group of meshes 300 to form glue dots on a battery cell 400 in a battery string. When printing glue on the battery cells 400 in a battery string, the meshes in this distribution form can print glue on one battery cell at a time.

[0065] See also Figure 7 and Figure 8 As shown, in other embodiments, all mesh holes 300 on the stencil are divided into two groups, namely a first group of mesh holes 310 and a second group of mesh holes 320, and the first group of mesh holes 310 and the second group of mesh holes 320 are arranged at intervals. In this structure, during the glue application operation, there may be two battery cells 410 to be printed with glue, such as the first battery cell 411 and the second battery cell 412 shown in the figure. The glue passes through the first group of mesh holes 310 to form glue spots on the first battery cell 411 in the battery string, and at the same time passes through the second group of mesh holes 320 to form glue spots on the second battery cell 412 in the battery string, so that the first battery cell 411 and the second battery cell 412 are printed with glue at the same time.

[0066] It should be noted that, when printing the first set of meshes 310 and the second set of meshes 320 on two battery cells 410 to be printed with glue at the same time, the two sets of meshes 300 can be arranged on one protrusion 200 (e.g. Fig. 9 As shown), two raised portions 200 arranged at intervals may also be used (as shown Fig.10 In the schematic diagram, a group of meshes 300 are respectively arranged on the first protruding portion 201 and the second protruding portion 202. When one protruding portion 200 is used, the structural integrity is better and a higher structural strength can be ensured. Fig. 9 and Fig.10 The schematic diagram shows the raised portion 200 located on the bottom surface of the screen body 100. In one implementation example, the bottom surface of the screen body 100 may be provided with a raised portion 200, see Fig. 9 As shown, the first group of meshes 310 and the second group of meshes 320 are both arranged on the one protrusion 200. In another embodiment, the bottom surface of the mesh body 100 may be provided with two protrusions 200, and the two protrusions 200 are arranged at intervals from each other, see Fig.10 As shown, a first group of meshes 310 is arranged on the first protruding portion 201 , and a second group of meshes 320 is arranged on the second protruding portion 202 .

[0067] It should be emphasized here that, in combination with the above drawings and descriptions of the protrusion 200, a protrusion 200 can be a planar plate-like structure 220, or a plurality of strip-like convex ribs 210 arranged at intervals from each other can be used as a protrusion 200. Therefore, the first protrusion 201 and the second protrusion 202 can be two planar plate-like structures spaced from each other, and each of the two planar plate-like structures is provided with a group of meshes 300. In addition, the first protrusion 201 (and / or the second protrusion 202) can also be in the form of a plurality of strip-like convex ribs 210 arranged at intervals from each other, and each of the strip-like convex ribs 210 forms a group of meshes 300, such as Fig.10 shown.

[0068] In addition to the aforementioned structural form of the protrusion 200 and the arrangement form of the mesh 300, the inventors have also found that the protrusion 200 and the mesh body 100 can be formed in an integrally formed structure, which has good structural integrity and higher overall structural strength. In addition, the mesh can be made of some high-strength materials to increase its strength, such as steel plates. The mesh made of steel plates has a smaller concave deformation after being subjected to force, which also helps to prevent the glue points on the battery cells that have been glued from being rubbed by the mesh during the gluing process.

[0069] The screen provided in the embodiment of the present application can also use the height of the glue dots printed on the battery cell as a reference, and flexibly select the height of the protrusion 200, as long as the height of the protrusion 200 is greater than the height of the glue dots (not shown in the figure). Exemplarily, the height of the protrusion 200 is any value from 0.1mm to 0.5mm, for example, 0.1mm, 0.18mm, 0.26mm, 0.34mm, 0.5mm.

[0070] The above description provides a detailed and comprehensive discussion of the mesh in the present application. Therefore, those skilled in the art can implement the mesh of the present application example based on these contents and use it to apply glue to battery strings with high quality.

[0071] Furthermore, in the application example of the screen, the present application also discloses a screen printing device, which includes a scraper assembly and the screen described in the above embodiment. The screen printing device realizes printing glue on the battery cell 400 through the cooperation of the scraper assembly and the above screen. After the battery cell 400 (refer to the battery cell 410 to be printed with glue, and the first battery cell 411 and the second battery cell 412 shown in the attached figure) is aligned with the mesh 300 of the screen, the scraper scrapes the screen to print the glue on the battery cell 400 through the mesh 300. In the screen printing device of the present application, since the mesh 300 is set on the protrusion 200, the protrusion 200 only covers the battery cell 410 to be printed with glue, and the height of the protrusion 200 is greater than the height of the glue point, even if the screen is concave and deformed, the screen will not rub against the battery cell 420 that has been printed with glue.

[0072] In addition, the present application also discloses a battery string gluing device, comprising: a battery string conveying device, and the silk-screen printing device described in the aforementioned embodiment, wherein: the silk-screen printing device is arranged on the conveying path of the battery string conveying device, and the screen of the silk-screen printing device is located above the battery string conveying device; the battery string conveying device is configured to convey the battery string in a step-by-step manner, so that the battery cells 400 to be printed with glue in the battery string are sequentially conveyed to the bottom of the raised portion 200 of the screen, and the scraper assembly is used to make the glue on the screen print through the mesh 300 onto the battery cell 410 to be printed with glue currently.

[0073] The present application improves the continuity of glue application by configuring the battery string conveying device and the screen printing device, and realizes the continuous glue printing of the battery cells 400 in the battery string. The device can flexibly set the stepping rhythm to adapt to the production rhythm of the previous process, such as the rhythm of welding the battery cell 400 and the welding ribbon, to avoid the glue application waiting and improve the work efficiency.

[0074] In order to allow the glue on the battery cells to solidify and form in time, the battery string gluing equipment also includes a curing device located downstream of the screen printing device. The battery string conveying device is also configured to convey the battery string to the curing device. The curing device is used to cure the glue points on the battery cells 420 in the battery string that have been printed with glue, so that the solder strips in the battery string are bonded to the battery cells 400 through the glue points.

[0075] Since the adhesive is printed on the soldering tape welded to the battery cell 400, after printing the adhesive on the battery cell 400, the adhesive is immediately cured by a curing device, and the soldering tape is further bonded to the battery cell through the adhesive. This helps to increase the bonding strength between the soldering tape and the battery cell 400, thereby effectively preventing the soldering tape from detaching from the battery cell 400, and further facilitating the subsequent handling, layout and other operations of the battery string.

[0076] It should be pointed out here that: the above battery string glue application equipment and screen printing device include the screen described in the above embodiment, and have the same beneficial effects as the above screen embodiment, so no further description is given. For technical details not disclosed in the battery string glue application equipment embodiment and screen printing device embodiment of this application, technicians in this field should refer to the description of the screen in the previous text for understanding, and no further description is given here to save space.

[0077] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "upper", "lower", "length", "width", "thickness", "height", "top", "bottom", "inside", "outside", "axial", "circumferential", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0078] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0079] Although multiple embodiments of the utility model have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may think of many changes, modifications and alternatives without departing from the idea and spirit of the utility model. It should be understood that in the process of practicing the utility model, various alternatives to the embodiments of the utility model described herein may be adopted. The attached claims are intended to define the scope of protection of the utility model, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A screen, characterized in that: The mesh plate comprises: The main body of the stencil; The bottom surface of the screen body is provided with a convex portion protruding downward, and the area where the convex portion is located matches the size of the battery sheet to be printed with glue; and, A plurality of mesh holes are formed through the screen body and the protruding portion, and the mesh holes are used for allowing glue to pass through to form glue dots on the battery sheet to be printed with glue, and the height of the glue dots is less than the height of the protruding portion.

2. The screen according to claim 1, characterized in that: The raised portion includes strip-shaped convex ribs arranged at intervals, and each of the strip-shaped convex ribs is formed with a plurality of mesh holes.

3. The screen plate according to claim 2, characterized in that: The strip-shaped convex ribs are arranged at intervals along the first direction, and each of the strip-shaped convex ribs extends along the second direction, and the second direction is perpendicular to the first direction.

4. The screen plate according to claim 2, characterized in that: Each of the strip-shaped convex ribs is provided with at least one row of mesh holes.

5. The screen plate according to claim 1, characterized in that: The raised portion is a planar plate-shaped structure, and all the mesh holes are arranged on the raised portion.

6. The screen plate according to claim 1, characterized in that: The mesh plate includes a group of mesh holes, and the group of mesh holes is used for allowing glue to pass through to form glue points on a battery sheet in a battery string.

7. The screen plate according to claim 1, characterized in that: The mesh plate includes two groups of mesh holes, and the two groups of mesh holes are arranged at intervals, so as to allow the glue to pass through so as to simultaneously form glue spots on two adjacent battery sheets in the battery string.

8. The screen plate according to claim 7, characterized in that: The protrusion is provided with one, and the two groups of mesh holes are both provided on the protrusion; or, The protrusions are provided with two and are arranged at intervals, and the two groups of mesh holes are respectively arranged on the two protrusions.

9. The screen plate according to claim 1, characterized in that: The protrusion and the mesh plate body are integrally formed.

10. The screen plate according to claim 1, characterized in that: The height of the protrusion is 0.1mm-0.5mm.

11. The screen plate according to claim 1, characterized in that: The mesh plate is a steel plate.

12. A screen printing device, characterized in that: The screen printing device comprises the screen plate and scraper assembly according to any one of claims 1 to 11.

13. A battery string glue application device, characterized in that: The battery string glue application device comprises a battery string conveying device and the screen printing device according to claim 12, wherein: The screen printing device is arranged on the conveying path of the battery string conveying device, and the screen of the screen printing device is located above the battery string conveying device; The battery string conveying device is configured to convey the battery string in a step-by-step manner, so that the battery cells to be printed with glue in the battery string are sequentially conveyed to the lower part of the raised portion of the screen, and the scraper assembly is used to print the glue on the screen through the mesh holes onto the battery cells to be printed with glue at present.

14. The battery string glue application device according to claim 13, characterized in that: The battery string gluing equipment also includes a curing device located after the screen printing device. The battery string conveying device is also configured to convey the battery string to the curing device. The curing device is used to cure the glue points on the battery cells in the battery string after the glue is printed, so that the solder strips in the battery string are bonded to the battery cells through the glue points.

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